1. There are "sensible" male characters, such as the Dr. (bonus: Doesn't promote male dominance). In fact, most adult characters aren't serious. That's one of the things that kids find funny.

2. Let's teach them realistic biology. They're difference species, how could they possibly have rabbit and elephant parents - what would the child be? But the fact every species is friends with each other suggests it's ok to "mix".

3. Daddy pig goes to work, and what about the Doctor? There's a teacher, policeman, mechanic. (straw-man: you have differentiated class by accent)

4. I'm far from a royalist, but there's no harm in teaching about the royal family and our heritage.

Disclaimer: I enjoyed watching Peppa Pig.